Do journal bearing turbos need restrictors?
Journal Bearing Turbo An oil restrictor is generally not needed except for oil-pressure-induced leakage. The recommended oil feed for journal bearing turbochargers is -4AN or hose/tubing with an ID of approximately 0.25”.
How do you check turbo oil feed?
Checking oil pressure at turbo oil supply. Then check oil return volume by putting return line into a container or via a inline flow gauge, dependant on engine size. Then compare this to factory (or to turbo manufacturers specifications) as there is no such thing as a “common” specification as far as Im concerned.
How much oil flow does a turbo need?
Oil pressure entering a ball-bearing turbocharger needs to be between 40 psi and 45 psi at the maximum engine operating speed. For many common passenger vehicle engines, this generally translates into a restrictor with a minimum of 0.040″ diameter orifice upstream of the oil inlet on the turbocharger center section.
Do ball bearing turbos need oil?
The journal bearing framework in a turbo works like the rod bearings in an engine. These bearings require enough oil to keep the parts isolated by a hydrodynamic film. On the off chance that the oil pressure is excessively low, the metal parts will come in contact causing premature wear.
Can you over oil a turbo?
If there is too much oil in the pan or if the turbocharger in your car is relatively lower, then oil can get through the seals and begin to blow out. This happens because the restrictor will starve the turbo of oil, which will cause all of the internals of the turbo (including all of the seals) to wear out.
How long will a turbo last with no oil?
Only takes a moment with no oil in the turbo while it’s spooled. The turbo bearings are in extreme conditions at all times and are friction bearings that require oil to function at all. If you have a ball bearing turbo, it MIGHT survive a little longer than a moment, like maybe two or three moments.
What happens if a turbo doesnt get enough oil?
If the supply of engine oil is restricted, even momentarily, during high speed operation the resulting build-up of heat caused by the contact between the shaft and its bearing surface can lead to micro welding or shaft seizure, which can destroy the turbocharger within a matter of seconds.
How long does it take for oil to get to the turbo?
Turbo oil supply lines can be as long as 1.5 m (5 ft). Depending on ambient temperatures and oil viscosity, it can take as long as 30 seconds for oil to reach the spinning turbo. However, as little as five seconds without oil can damage the turbo’s bearings, reducing its life and overall efficiency.